Some 34 years after first seeking the job, Joe Biden has been sworn in as the 46th US president, bringing to an end the most tumultuous administration of modern times and charting a new course to tackle Covid-19 and unite a splintered nation.
Health of the liberal justice is closely watched because a vacancy in the nine-member Supreme Court would give President Donald Trump the opportunity to appoint a third justice to 5-4 conservative majority court to prod it further to the right.